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NPM poll down nodes

Table of contents

Overview

This article provides brief information on polling down nodes.

Environment

All NPM versions

Detail

When Orion does not get a response from a node, we cannot immediately assume the node is down, as there are a number of other reasons why the node may not be responding other than it is being down. We want to be sure the node is down before we mark it as such. How do we do this:

When a node goes down it may not go down for long, depending on your polling settings it may miss the node going down in which case the alert will not fire at all.

Say you are polling every 120seconds - which is the default polling, If a node goes down at the very start of the 120 seconds it has to wait 120 seconds before it gets polled again. When it gets polled again and does not respond Orion puts the node into warning status and then goes into Fast Polling where it polls the node every 10 seconds for 120 seconds. If the node responds then it will put the node back into an up state.

Orion is using ping (ICMP) or SNMP to get a response of the device. Make sure that these devices are reachable on your Orion server and no network connectivity issues so that you can avoid this kind of behavior.